dealer vs card player

dealer and card player both are nouns.

Word	Noun	Adjective	Verb	Adverb
dealer	Yes	No	No	No
card player	Yes	No	No	No

As nouns, card player is a hypernym of dealer; that is, card player is a word with a broader meaning than dealer:

dealer (noun)	card player (noun)
a firm engaged in trading	someone who plays (or knows how to play) card games
a seller of illicit goods
the person who distributes the playing cards in a card game
someone who purchases and maintains an inventory of goods to be sold
the major party to a financial transaction at a stock exchange; buys and sells for his own account